Index of Subjects 



349 



Degrees of freedom of a molecule, 172, 221, 



335, 337 



Demon, sorting demon of Maxwell, 168 

 Density, definition, 11, 46 



,, distribution in field of force, 70, 157 

 ,, influenced by aggregation, 331 

 ,, effective molecular, see Effective 

 Diameter of molecules : 



,, ,, apparent variation with temperature, 



254, 275, 342 

 ,, ,, determination of numerical values, 



339 



Diatomic gases, 223, 307, 337 

 Diffusion of gases, 5, 268, 298 



,, experimental values, 273 

 Dissipation of energy, 173, 176, 197, 337 

 ,, function for a gas, 176 



of planetary atmospheres, 309 



Dissociation, 335 



Earth's atmosphere, constitution of, 315, 316 

 ,, equilibrium of, 310 



dissipation of, 318 



Effective molecular density, 58 



,, ,, with reference to intermolecular 



forces, 72 



,, ,, calculation of, 122 

 Electric arc, light of, 208, 209 



,, vacuum tube, light of, 209 

 Energy, equipartition of, see Equipartition 

 ,, internal, of a molecule, 65, 172, 337 

 ,, transfer of, by collisions, 197 

 ,, transfer of, by molecular motion, 301 

 Entropy, 165 

 Equilibrium of atmosphere, 309 



,, of gas in field of force, 156 



of vapour in contact with liquid, 



3, 131, 330 

 Equipartition of energy, 67 



,, ,, enunciated by Waterston, 79 



,, ,, Maxwell's treatment of, 79 



,, ,, modified by interaction with ether, 



173, 176 



Escape of gases from the atmosphere, 318 

 Expansive property of a gas, 3, 145 



Force, intermolecular, see Intermolecular 

 Free-paths, total number described, 31 

 average duration of, 31 



mean length of, 31, 232, 233 



Friction, Kinetic Theory interpretation of, 3, 

 248 



Generalised space, 33 



H-theorem, 19, 32 ; second proof, 88 

 ,, analysis of theorem, 59 



,, relation to theorem of increasing 



entropy, 165 

 Heat, conduction of, 259, 297 ; experimental 



values, 267 



,, convection of, 264 

 Historical notes : 



General Theory, 9 

 Proofs of Law of Distribution, 51 

 Proofs of Law of Equipartition, 79 

 Partition of Energy in Loaded Spheres, 



104 



Planetary Atmospheres, 325 

 Hydrodynamical equations of a gas, 149 



Impact of masses, interpreted by Kinetic Theory, 



2, 29 

 Incandescence, temperature of, 207 ; of gases, 



208 



Integrating factors of energy-equation, 163 

 Intermolecular force in gases, 64, 73, 153, 326, 



345 



,, ,, in liquids and solids, 343 



law of force, 256, 275, 



326 



Intermolecular pressure, 160, 162, 343 

 Internal pressure in a gas, 160, 162, 332 



,, energy of a molecule, 65, 172, 337 

 Irreversibility of motion, apparent, 32, 59, 165 

 Isopentane, critical isothermal of, 135 

 Isothermals, 127 



Isothermal equilibrium of atmosphere, 309, 

 312 



Latent heat, 343 



Law of distribution, definition, 13 

 ,, ,, statistical method, 12 

 ,, ,, method of general dynamics, 33 

 ,, ,, comparison of the two methods, 53 

 ,, ,, extension to complex molecules, 61 

 ,, ,, Maxwell's original proof, 51 



Light, emitted by heated gases, 208 ; by electric 

 action, 208 



Liouville's Theorem, 62 ; modified for non- 

 conservative system, 178 



Liquid in contact with vapour, 3, 131, 330 



Liquid state, continuity with gaseous state, 

 131, 329 



Loaded spheres, see Sphere 



Mass and Molecular motion, 27, 247 

 Mass motion of a gas, equations of, 149 

 Masses of molecules, 7 



